Question

Derivation of stefan boltzmann law from planck's law .

Answer 1

Stefan-Boltzmann Law. Specifically, this law states that:The total energy radiated per unit surface area of a black body across all wavelengths per unit time is directly proportional to the fourth power of the black body’s thermodynamic temperature T.Expressed in appropriate terms, mathematically speaking: Eq. 1, whereis theEmissive Power(also known as the black-body irradiance), is the Stefan-Boltzmann constant, 5,67 × 10-8 W/ m2 K4, and Tis the absolute temperature of the emitting surface

Answer 2

ANSWER IS IN THE IMAGE